When i Have half a tank of petrol bike cuts out

Odds are that if it sat for a year with fuel in it, the carb may be gummed up. Opening the throttle will cause an immediate engine stop if it is not getting fuel.

I'd recommend a "clean out the carb" project, including using air to blow out allof the small orifices.

Check valves may be faulty in the fuel line. Your gauge may not be working properly, showing 1/2 tank when it is actually empty. Have you checked how many miles till it stops? Also try this link.
Mercedes Benz EPC Type W203 203 Class Information

run the fault codes and look for problems in the canister purge system

With the little info that you have given I would first say to verify that the carb has an un restricted supply of fuel getting to it, has the proper fuel level in the carb bowl when full. If the unit has a vaccuum operated(automatic) fuel valve ckeck the vaccuum hose for good condition. If it has a PRIme position try running in this position. If all is good the valve may be bad. Good luck.

Ride the bike 20 or so miles on open road. Stop and remove plug to inspect. 'Are they black or white ?


Black =rich white=lean

you need ajust the floats in the bole to let more fuel in

possible weak battery? its better after a run... when it's charged a bit off the alternator. it's possibly not holding the charge overnight and being a bit sluggish in the morning... have it checked - a half charged battery makes a half charged coil... zap? . which will spark but not quite so good as a fully charged coil ZAP!
also check the plug for oil fouling and check if the oil level is too high - if so drain the oil down to the Full mark - this can happen after a lot of failed starting attempts as unburned petrol gets past the cylinder into the sump, filling it up... If THIS has happened you need to change the oil and filter, oil full of petrol does not lubricate the engine!!! - I think its 10W30 for your bike, it takes about 2 pints.
Sounds like its almost definitely electrical tho...

if you turn a motorbike tank into reserve..
the patrol wont go to a little filter.. soo.. thats the splutter and so..

yes it is possible. buy yourself a can of WD40 (penetrating oil)... spray all electrical parts and wiring you can see with that. it will repel the water but it does not conduct electricity. also buy a bottle of gas line antifreeze and put half of it in your fuel tank. it sucks up any water you may have in your fuel (petrol)